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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f21aa22af8e4fb6073fd676becbc2e5f83f5a66c883ea93a5e9e0b1d47b38137' 
  AND token = 'nB2qCx9uWJJEqrLou0ueCWGtESc4IfpNewR2A7jaZ7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}